20.500.12556/RUL-181467 Shear resistance of bridge I-girders with diagonal stiffener - design proposal Steel I-girders with diagonal stiffeners offer an effective means of increasing shear resistance in bridge applications by enhancing both elastic buckling and post-buckling resistance. However, no dedicated design rules exist for such configurations in current structural design standards, particularly for carbon steel girders. This study addresses this gap through an extensive numerical investigation of the shear buckling behaviour and ultimate resistance of web panels stiffened along the compression diagonal. A finite element model (FEM), validated against full-scale experiments, supports a broad parametric study covering aspect ratio, web slenderness, stiffener rigidity and geometric imperfections. The numerical results are used to assess existing resistance models, to develop a new expression for the shear buckling coefficient, and to propose several design models for ultimate shear resistance. A reliability assessment confirms compliance with Eurocode target safety levels. The study provides the first validated and comprehensive design framework for carbon-steel I-girders with diagonal stiffeners placed along the compression diagonal, bridging a key gap in current design standards and enabling more efficient and reliable shear design of steel bridge girders. civil engineering steel I-girders diagonal stiffeners shear buckling coefficient shear buckling resistance design model FEM reliability gradbeništvo jekleni I-nosilci diagonalne ojačitve koeficient strižnega uklona strižna nosilnost računski model metoda končnih elementov MKE zanesljivost true false true Angleški jezik Slovenski jezik Članek v reviji 2026-04-08 13:33:47 2026-04-08 13:33:54 2026-04-09 04:44:11 0000-00-00 00:00:00 2026 0 0 20 str. Letn. 242 art. 110361 jul. 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2026-03-30 624.014 0143-974X 10.1016/j.jcsr.2026.110361 274407939 1-s2.0-S0143974X26001306-main.pdf 1-s2.0-S0143974X26001306-main.pdf 1 796694EB9B7DDD354810012699B8BD64 ae6e8d812960bd0094989bb63b1d4a63eeaa70a863df1c1c9187195841a2f069 a618412b-3341-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=231963 https://doi.org/10.1016/j.jcsr.2026.110361 1 c45a0139-333e-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=231962 Fakulteta za gradbeništvo in geodezijo 0 0 0